TY  - JOUR
AU  - Bezdan, Atila
AU  - Bezdan, Jovana
AU  - Marković, Monika
AU  - Mirčetić, Dejan
AU  - Baumgertel, Aleksandar
AU  - Salvai, Andrea
AU  - Blagojević, Boško
PY  - 2025
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/1538
AB  - Waterlogging disasters are one of the most severe and widespread agricultural meteorological disasters. They affect about 15% of land surface globally, causing a significant reduction in crop growth and yields. This paper presents an objective methodology for assessing waterlogging risk, primarily in non-urban, predominantly agricultural areas. The waterlogging risk was assessed by evaluating vulnerability and hazard based on key environmental, anthropogenic, and climatic factors. The weights of factors affecting the waterlogging vulnerability were determined using the entropy weight method (EWM), assuring the objectivity of the overall evaluation results. The obtained waterlogging risk map was validated by comparing it with observed and detected waterlogged sites using Sentinel-2 imagery and Random Forest classification. The key novelties of this study are the use of the entropy weight method to objectively determine the relative importance of factors influencing waterlogging vulnerability, and a two-step validation process which includes field-based comparison and remote sensing validation. The presented methodology was demonstrated in the Vojvodina region, Serbia. The following waterlogging vulnerability factors were used: soil properties, geomorphology, surface depressions, average phreatic water table depth, and land cover. The EWM shows that surface depressions and soil properties have the most significant influence on waterlogging vulnerability. The highest waterlogging hazard classes occur in about 31% of the analyzed territory. The waterlogging hazard was estimated based on water balance for the non-vegetation season and maximum daily precipitation in spring, both modeled using the Generalize Extreme Value distribution function. The highest waterlogging hazard classes occur in about 31% of the analyzed territory. The final risk map shows that the high waterlogging risk occurs in about 11% of the territory. Those are mainly areas in the central, eastern, and southeastern parts of the Vojvodina region, usually along the main watercourses. High agreement between the detected waterlogged areas and the produced waterlogging risk map was achieved, validating the proposed methodology. The presented waterlogging risk assessment methodology is valuable for planning and policy-making for various water management and environmental activities. Although it is demonstrated in Vojvodina, by selecting the appropriate factors of vulnerability and hazard, it can be applied to any other region.
T2  - CATENA
T1  - An objective methodology for waterlogging risk assessment based on the entropy weighting method and machine learning
SP  - 108618
VL  - 249
DO  - 10.1016/j.catena.2024.108618
ER  - 

@article{
author = "Bezdan, Atila and Bezdan, Jovana and Marković, Monika and Mirčetić, Dejan and Baumgertel, Aleksandar and Salvai, Andrea and Blagojević, Boško",
year = "2025",
abstract = "Waterlogging disasters are one of the most severe and widespread agricultural meteorological disasters. They affect about 15% of land surface globally, causing a significant reduction in crop growth and yields. This paper presents an objective methodology for assessing waterlogging risk, primarily in non-urban, predominantly agricultural areas. The waterlogging risk was assessed by evaluating vulnerability and hazard based on key environmental, anthropogenic, and climatic factors. The weights of factors affecting the waterlogging vulnerability were determined using the entropy weight method (EWM), assuring the objectivity of the overall evaluation results. The obtained waterlogging risk map was validated by comparing it with observed and detected waterlogged sites using Sentinel-2 imagery and Random Forest classification. The key novelties of this study are the use of the entropy weight method to objectively determine the relative importance of factors influencing waterlogging vulnerability, and a two-step validation process which includes field-based comparison and remote sensing validation. The presented methodology was demonstrated in the Vojvodina region, Serbia. The following waterlogging vulnerability factors were used: soil properties, geomorphology, surface depressions, average phreatic water table depth, and land cover. The EWM shows that surface depressions and soil properties have the most significant influence on waterlogging vulnerability. The highest waterlogging hazard classes occur in about 31% of the analyzed territory. The waterlogging hazard was estimated based on water balance for the non-vegetation season and maximum daily precipitation in spring, both modeled using the Generalize Extreme Value distribution function. The highest waterlogging hazard classes occur in about 31% of the analyzed territory. The final risk map shows that the high waterlogging risk occurs in about 11% of the territory. Those are mainly areas in the central, eastern, and southeastern parts of the Vojvodina region, usually along the main watercourses. High agreement between the detected waterlogged areas and the produced waterlogging risk map was achieved, validating the proposed methodology. The presented waterlogging risk assessment methodology is valuable for planning and policy-making for various water management and environmental activities. Although it is demonstrated in Vojvodina, by selecting the appropriate factors of vulnerability and hazard, it can be applied to any other region.",
journal = "CATENA",
title = "An objective methodology for waterlogging risk assessment based on the entropy weighting method and machine learning",
pages = "108618",
volume = "249",
doi = "10.1016/j.catena.2024.108618"
}

Bezdan, A., Bezdan, J., Marković, M., Mirčetić, D., Baumgertel, A., Salvai, A.,& Blagojević, B.. (2025). An objective methodology for waterlogging risk assessment based on the entropy weighting method and machine learning. in CATENA, 249, 108618.
https://doi.org/10.1016/j.catena.2024.108618

Bezdan A, Bezdan J, Marković M, Mirčetić D, Baumgertel A, Salvai A, Blagojević B. An objective methodology for waterlogging risk assessment based on the entropy weighting method and machine learning. in CATENA. 2025;249:108618.
doi:10.1016/j.catena.2024.108618 .

Bezdan, Atila, Bezdan, Jovana, Marković, Monika, Mirčetić, Dejan, Baumgertel, Aleksandar, Salvai, Andrea, Blagojević, Boško, "An objective methodology for waterlogging risk assessment based on the entropy weighting method and machine learning" in CATENA, 249 (2025):108618,
https://doi.org/10.1016/j.catena.2024.108618 . .

TY  - JOUR
AU  - Bezdan, Atila
AU  - Bezdan, Jovana
AU  - Blagojević, Boško
AU  - Baumgertel, Aleksandar
AU  - Lazić, Irida
AU  - Tošić, Milica
AU  - Đurđević, Vladimir
PY  - 2024
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/1458
AB  - One of the frequently used drought metrics in scientific research is the consecutive dry days (CDDs) because it effectively indicates short-term droughts important to ecosystems and agriculture. CDDs are expected to increase in many parts of the world in the future. In Serbia, both the frequency and severity of droughts have increased in recent decades, with most droughts being caused by a lack of precipitation during the warmer months of the year and an increase in evapotranspiration due to higher temperatures. In this study, the frequency and duration of extreme CDDs in the growing season in Serbia were analysed for the past (1950-2019) and the future (2020-2100) period. The Threshold Level Method over precipitation data series was used to analyse CDD events, where extreme CDDs are defined as at least 15 consecutive days without precipitation. In contrast to the original definition of the CDD as the maximum number of consecutive days with precipitation less than 1 mm, here we defined the threshold that is more suitable for agriculture because field crops can experience water stress after 15 days of no rainfall or irrigation. An approach for modelling the stochastic process of extreme CDDs based on the Zelenhasi & cacute;-Todorovi & cacute; (ZT) method was applied in this research. The ZT method was modified by selecting a different distribution function for modelling the durations of the longest CDD events, enabling a more reliable calculation of probabilities of occurrences. According to the results, future droughts in Serbia are likely to be more frequent and severe than those in the past. The duration of the longest CDDs in a growing season will be extended in the future, lasting up to 62 days with a 10-year return period and up to 94 days with a 100-year return period. Results indicate a worsening of drought conditions, especially in the eastern and northern parts of Serbia. The results can help decision-makers adapt agricultural strategies to climate change by providing information on the expected durations of extreme rainless periods in future growing seasons. Although the analysis was performed in Serbia, it can be applied to any other region.
T2  - International Journal of Climatology
T1  - Observed characteristics and projected future changes of extreme consecutive dry days events of the growing season in Serbia
EP  - 4141
IS  - 11
SP  - 4127
VL  - 44
DO  - 10.1002/joc.8573
UR  - conv_1804
ER  - 

@article{
author = "Bezdan, Atila and Bezdan, Jovana and Blagojević, Boško and Baumgertel, Aleksandar and Lazić, Irida and Tošić, Milica and Đurđević, Vladimir",
year = "2024",
abstract = "One of the frequently used drought metrics in scientific research is the consecutive dry days (CDDs) because it effectively indicates short-term droughts important to ecosystems and agriculture. CDDs are expected to increase in many parts of the world in the future. In Serbia, both the frequency and severity of droughts have increased in recent decades, with most droughts being caused by a lack of precipitation during the warmer months of the year and an increase in evapotranspiration due to higher temperatures. In this study, the frequency and duration of extreme CDDs in the growing season in Serbia were analysed for the past (1950-2019) and the future (2020-2100) period. The Threshold Level Method over precipitation data series was used to analyse CDD events, where extreme CDDs are defined as at least 15 consecutive days without precipitation. In contrast to the original definition of the CDD as the maximum number of consecutive days with precipitation less than 1 mm, here we defined the threshold that is more suitable for agriculture because field crops can experience water stress after 15 days of no rainfall or irrigation. An approach for modelling the stochastic process of extreme CDDs based on the Zelenhasi & cacute;-Todorovi & cacute; (ZT) method was applied in this research. The ZT method was modified by selecting a different distribution function for modelling the durations of the longest CDD events, enabling a more reliable calculation of probabilities of occurrences. According to the results, future droughts in Serbia are likely to be more frequent and severe than those in the past. The duration of the longest CDDs in a growing season will be extended in the future, lasting up to 62 days with a 10-year return period and up to 94 days with a 100-year return period. Results indicate a worsening of drought conditions, especially in the eastern and northern parts of Serbia. The results can help decision-makers adapt agricultural strategies to climate change by providing information on the expected durations of extreme rainless periods in future growing seasons. Although the analysis was performed in Serbia, it can be applied to any other region.",
journal = "International Journal of Climatology",
title = "Observed characteristics and projected future changes of extreme consecutive dry days events of the growing season in Serbia",
pages = "4141-4127",
number = "11",
volume = "44",
doi = "10.1002/joc.8573",
url = "conv_1804"
}

Bezdan, A., Bezdan, J., Blagojević, B., Baumgertel, A., Lazić, I., Tošić, M.,& Đurđević, V.. (2024). Observed characteristics and projected future changes of extreme consecutive dry days events of the growing season in Serbia. in International Journal of Climatology, 44(11), 4127-4141.
https://doi.org/10.1002/joc.8573
conv_1804

Bezdan A, Bezdan J, Blagojević B, Baumgertel A, Lazić I, Tošić M, Đurđević V. Observed characteristics and projected future changes of extreme consecutive dry days events of the growing season in Serbia. in International Journal of Climatology. 2024;44(11):4127-4141.
doi:10.1002/joc.8573
conv_1804 .

Bezdan, Atila, Bezdan, Jovana, Blagojević, Boško, Baumgertel, Aleksandar, Lazić, Irida, Tošić, Milica, Đurđević, Vladimir, "Observed characteristics and projected future changes of extreme consecutive dry days events of the growing season in Serbia" in International Journal of Climatology, 44, no. 11 (2024):4127-4141,
https://doi.org/10.1002/joc.8573 .,
conv_1804 .

TY  - JOUR
AU  - Baumgertel, Aleksandar
AU  - Lukić, Sara
AU  - Caković, Milica
AU  - Lazić, Irida
AU  - Tošić, Milica
AU  - Momirović, Natalija
AU  - Pandey, Shachi
AU  - Bezdan, Atila
AU  - Blagojević, Boško
AU  - Đurđević, Vladimir
PY  - 2024
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/1495
AB  - Climate change has a potentially negative impact on the overall vitality of vegetation in both forested and agricultural areas. A comprehensive understanding of the interaction between climate and vegetation across various land cover types holds significant importance from multiple perspectives. This research examined the current state of vegetation trends and their interplay with climate parameters, specifically temperature and precipitation. Additionally, it aimed to provide insights into the anticipated changes in these climate parameters in the future, across the entire area of the Republic of Serbia. The vegetation was observed using the Normalized Difference Vegetation Index (NDVI) obtained from AVHRR/NOAA 11 satellite for the vegetation season (May-October) from 1981 to 2021, while the climate data records used the examination of the relationship between climate indicators and vegetation were monthly mean 2m temperature and precipitation obtained from the ERA5-Land (from April to October). The nonparametric Mann-Kendall test implemented with the Sen's slope estimator and the Pearson correlation coefficient (r) was utilized to identify trends (for the NDVI and climate variables) and the strength of the correlation, respectively. To obtain the information of temperature and precipitation change in future (from 2071 to 2100), the ensemble mean of the eight climate models, for vegetation period and summer season (June-July-August) from the EURO-CORDEX database was used. Results show relatively high NDVI values ( gt  0.5) over the entire area and the statistically significant (p  lt  0.005) positive NDVI trend increasing (up to 0.0006 year(-1) from the north (mainly agriculture cover) to the south (forest cover). In agricultural areas, a positive statistically significant correlation (r = 0.4-0.6, p  lt  0.005) indicates that the quality of vegetation cover in rainfed agriculture is directly dependent on the amount of precipitation, which serves as the sole source of moisture input. In contrast, the situation differs in forested areas where the correlation between NDVI and precipitation is often statistically not significant (p  gt  0.005) indicating that forests, because of their characteristics, are less dependent on the amount of precipitation. Regarding temperature, in agricultural areas, there is a positive correlation with NDVI, although it does not reach statistical significance. Conversely, in forested areas, a significant positive correlation is observed between NDVI and temperature which even positively contributes to the development of forest vegetation. In future, the recorded decline in precipitation (a substantial 22.72% drop) and the concurrent rise in temperature (up to 4.39(degrees)C) in vegetation period, until 2100 might impact the reduction of NDVI.
T2  - International Journal of Environmental Research
T1  - Spatio-Temporal Analysis of Vegetation Response to Climate Change, Case Study: Republic of Serbia
IS  - 2
VL  - 18
DO  - 10.1007/s41742-024-00571-z
UR  - conv_1767
ER  - 

@article{
author = "Baumgertel, Aleksandar and Lukić, Sara and Caković, Milica and Lazić, Irida and Tošić, Milica and Momirović, Natalija and Pandey, Shachi and Bezdan, Atila and Blagojević, Boško and Đurđević, Vladimir",
year = "2024",
abstract = "Climate change has a potentially negative impact on the overall vitality of vegetation in both forested and agricultural areas. A comprehensive understanding of the interaction between climate and vegetation across various land cover types holds significant importance from multiple perspectives. This research examined the current state of vegetation trends and their interplay with climate parameters, specifically temperature and precipitation. Additionally, it aimed to provide insights into the anticipated changes in these climate parameters in the future, across the entire area of the Republic of Serbia. The vegetation was observed using the Normalized Difference Vegetation Index (NDVI) obtained from AVHRR/NOAA 11 satellite for the vegetation season (May-October) from 1981 to 2021, while the climate data records used the examination of the relationship between climate indicators and vegetation were monthly mean 2m temperature and precipitation obtained from the ERA5-Land (from April to October). The nonparametric Mann-Kendall test implemented with the Sen's slope estimator and the Pearson correlation coefficient (r) was utilized to identify trends (for the NDVI and climate variables) and the strength of the correlation, respectively. To obtain the information of temperature and precipitation change in future (from 2071 to 2100), the ensemble mean of the eight climate models, for vegetation period and summer season (June-July-August) from the EURO-CORDEX database was used. Results show relatively high NDVI values ( gt  0.5) over the entire area and the statistically significant (p  lt  0.005) positive NDVI trend increasing (up to 0.0006 year(-1) from the north (mainly agriculture cover) to the south (forest cover). In agricultural areas, a positive statistically significant correlation (r = 0.4-0.6, p  lt  0.005) indicates that the quality of vegetation cover in rainfed agriculture is directly dependent on the amount of precipitation, which serves as the sole source of moisture input. In contrast, the situation differs in forested areas where the correlation between NDVI and precipitation is often statistically not significant (p  gt  0.005) indicating that forests, because of their characteristics, are less dependent on the amount of precipitation. Regarding temperature, in agricultural areas, there is a positive correlation with NDVI, although it does not reach statistical significance. Conversely, in forested areas, a significant positive correlation is observed between NDVI and temperature which even positively contributes to the development of forest vegetation. In future, the recorded decline in precipitation (a substantial 22.72% drop) and the concurrent rise in temperature (up to 4.39(degrees)C) in vegetation period, until 2100 might impact the reduction of NDVI.",
journal = "International Journal of Environmental Research",
title = "Spatio-Temporal Analysis of Vegetation Response to Climate Change, Case Study: Republic of Serbia",
number = "2",
volume = "18",
doi = "10.1007/s41742-024-00571-z",
url = "conv_1767"
}

Baumgertel, A., Lukić, S., Caković, M., Lazić, I., Tošić, M., Momirović, N., Pandey, S., Bezdan, A., Blagojević, B.,& Đurđević, V.. (2024). Spatio-Temporal Analysis of Vegetation Response to Climate Change, Case Study: Republic of Serbia. in International Journal of Environmental Research, 18(2).
https://doi.org/10.1007/s41742-024-00571-z
conv_1767

Baumgertel A, Lukić S, Caković M, Lazić I, Tošić M, Momirović N, Pandey S, Bezdan A, Blagojević B, Đurđević V. Spatio-Temporal Analysis of Vegetation Response to Climate Change, Case Study: Republic of Serbia. in International Journal of Environmental Research. 2024;18(2).
doi:10.1007/s41742-024-00571-z
conv_1767 .

Baumgertel, Aleksandar, Lukić, Sara, Caković, Milica, Lazić, Irida, Tošić, Milica, Momirović, Natalija, Pandey, Shachi, Bezdan, Atila, Blagojević, Boško, Đurđević, Vladimir, "Spatio-Temporal Analysis of Vegetation Response to Climate Change, Case Study: Republic of Serbia" in International Journal of Environmental Research, 18, no. 2 (2024),
https://doi.org/10.1007/s41742-024-00571-z .,
conv_1767 .

TY  - JOUR
AU  - Savić, Radovan
AU  - Stajić, Milica
AU  - Blagojević, Boško
AU  - Bezdan, Atila
AU  - Vranesević, Milica
AU  - Nikolić-Jokanović, Vesna
AU  - Baumgertel, Aleksandar
AU  - Bubalo Kovacić, Marina
AU  - Horvatinec, Jelena
AU  - Ondrasek, Gabrijel
PY  - 2022
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/1281
AB  - Conserving clean and safe freshwater is a global challenge, with nitrogen (N) and phosphorus (P) as frequent limiting factors affecting water quality due to eutrophication. This paper provides a critical overview of the spatiotemporal variability in both nutrient concentrations and their total mass ratio (TN:TP) in the canal network of the Hydro system Danube-Tisza-Danube at 21 measuring locations monitored by the Environmental Protection Agency of the Republic of Serbia over a length of almost 1000 km, collected once a month during the last decade. A spatiotemporal variation in nutrient concentrations in the tested surface water samples was confirmed by correlations and cluster analyses. The highest TN concentrations were found in winter and early spring (non-vegetation season), and the highest TP concentrations in the middle of the year (vegetation season). The TN:TP mass ratio as an indicator of the eutrophication pointed out N and P co-limitation (TN:TP 8-24) in 64% of samples, N limitation (TN:TP  lt  8) was detected in 27% and P limitation (TN:TP  gt  24) in the remaining 9% of water samples. Such observations indicate slow-flowing, lowland water courses exposed to the effects of non-point and point contamination sources as nutrient runoff from the surrounding farmlands and/or urban and industrial zones, but further investigation is needed for clarification. These results are an important starting point for reducing N and P runoff loads and controlling source pollution to improve water quality and underpin recovery from eutrophication in the studied watershed.
T2  - Agriculture-Basel
T1  - Nitrogen and Phosphorus Concentrations and Their Ratios as Indicators of Water Quality and Eutrophication of the Hydro-System Danube-Tisza-Danube
IS  - 7
VL  - 12
DO  - 10.3390/agriculture12070935
UR  - conv_1650
ER  - 

@article{
author = "Savić, Radovan and Stajić, Milica and Blagojević, Boško and Bezdan, Atila and Vranesević, Milica and Nikolić-Jokanović, Vesna and Baumgertel, Aleksandar and Bubalo Kovacić, Marina and Horvatinec, Jelena and Ondrasek, Gabrijel",
year = "2022",
abstract = "Conserving clean and safe freshwater is a global challenge, with nitrogen (N) and phosphorus (P) as frequent limiting factors affecting water quality due to eutrophication. This paper provides a critical overview of the spatiotemporal variability in both nutrient concentrations and their total mass ratio (TN:TP) in the canal network of the Hydro system Danube-Tisza-Danube at 21 measuring locations monitored by the Environmental Protection Agency of the Republic of Serbia over a length of almost 1000 km, collected once a month during the last decade. A spatiotemporal variation in nutrient concentrations in the tested surface water samples was confirmed by correlations and cluster analyses. The highest TN concentrations were found in winter and early spring (non-vegetation season), and the highest TP concentrations in the middle of the year (vegetation season). The TN:TP mass ratio as an indicator of the eutrophication pointed out N and P co-limitation (TN:TP 8-24) in 64% of samples, N limitation (TN:TP  lt  8) was detected in 27% and P limitation (TN:TP  gt  24) in the remaining 9% of water samples. Such observations indicate slow-flowing, lowland water courses exposed to the effects of non-point and point contamination sources as nutrient runoff from the surrounding farmlands and/or urban and industrial zones, but further investigation is needed for clarification. These results are an important starting point for reducing N and P runoff loads and controlling source pollution to improve water quality and underpin recovery from eutrophication in the studied watershed.",
journal = "Agriculture-Basel",
title = "Nitrogen and Phosphorus Concentrations and Their Ratios as Indicators of Water Quality and Eutrophication of the Hydro-System Danube-Tisza-Danube",
number = "7",
volume = "12",
doi = "10.3390/agriculture12070935",
url = "conv_1650"
}

Savić, R., Stajić, M., Blagojević, B., Bezdan, A., Vranesević, M., Nikolić-Jokanović, V., Baumgertel, A., Bubalo Kovacić, M., Horvatinec, J.,& Ondrasek, G.. (2022). Nitrogen and Phosphorus Concentrations and Their Ratios as Indicators of Water Quality and Eutrophication of the Hydro-System Danube-Tisza-Danube. in Agriculture-Basel, 12(7).
https://doi.org/10.3390/agriculture12070935
conv_1650

Savić R, Stajić M, Blagojević B, Bezdan A, Vranesević M, Nikolić-Jokanović V, Baumgertel A, Bubalo Kovacić M, Horvatinec J, Ondrasek G. Nitrogen and Phosphorus Concentrations and Their Ratios as Indicators of Water Quality and Eutrophication of the Hydro-System Danube-Tisza-Danube. in Agriculture-Basel. 2022;12(7).
doi:10.3390/agriculture12070935
conv_1650 .

Savić, Radovan, Stajić, Milica, Blagojević, Boško, Bezdan, Atila, Vranesević, Milica, Nikolić-Jokanović, Vesna, Baumgertel, Aleksandar, Bubalo Kovacić, Marina, Horvatinec, Jelena, Ondrasek, Gabrijel, "Nitrogen and Phosphorus Concentrations and Their Ratios as Indicators of Water Quality and Eutrophication of the Hydro-System Danube-Tisza-Danube" in Agriculture-Basel, 12, no. 7 (2022),
https://doi.org/10.3390/agriculture12070935 .,
conv_1650 .

TY  - JOUR
AU  - Savić, Radovan
AU  - Ondrasek, Gabrijel
AU  - Zemunac, Rados
AU  - Bubalo Kovacić, Marina
AU  - Kranjcec, Filip
AU  - Nikolić-Jokanović, Vesna
AU  - Bezdan, Atila
PY  - 2021
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/1218
AB  - Sediment matrices, as integral organo-mineral parts of aquatic bodies, can effectively bind and accumulate nutrients and potentially hazardous substances from diffuse and/or point sources of contamination. In this study, we analysed the longitudinal distribution of macronutrients (total N and available P and K) and the mechanical composition of the sediments of Jegricka watercourse (a part of the multi-functional Danube-Tisa-Danube canal network) known for its exposure to anthropogenic loads. The results showed that the nutrient pollution index was mostly above 1.0 (in 76%, 86% and 93% of the analysed samples for K, N and P, respectively), and the mean values for N, P and K were 2.69, 1.92 and 1.24, respectively. The average content of all nutrients and the sand fraction were significantly higher, whereas the clay fraction was considerably lower, in the sediment samples than in the adjacent arable Chernozem soil used as a benchmark. The differences in the nutrient contents and mechanical properties in the sediments were measured longitudinally (at upstream vs. downstream stations) and assessed using correlation, cluster analysis, and principal component analysis. The results suggest that the nutrient sources in the sediments as well as their transport and loading mechanisms along Jegricka watercourse are diverse and complex, likely driven by a combination of untreated industrial/urban wastewater discharges, erosion and surface runoff from the surrounding agricultural land. As a majority of the analysed watercourse banks belong to areas of special ecological value, the obtained results may be useful: i) indicators for designing and implementation of sustainable land/water policies and measures for the protection and rehabilitation of these valuable ecosystems, ii) inputs for testing/calibrating the sediment transport models and iii) the basis for sediment management.
T2  - Science of the Total Environment
T1  - Longitudinal distribution of macronutrients in the sediments of Jegricka watercourse in Vojvodina, Serbia
VL  - 754
DO  - 10.1016/j.scitotenv.2020.142138
UR  - conv_1513
ER  - 

@article{
author = "Savić, Radovan and Ondrasek, Gabrijel and Zemunac, Rados and Bubalo Kovacić, Marina and Kranjcec, Filip and Nikolić-Jokanović, Vesna and Bezdan, Atila",
year = "2021",
abstract = "Sediment matrices, as integral organo-mineral parts of aquatic bodies, can effectively bind and accumulate nutrients and potentially hazardous substances from diffuse and/or point sources of contamination. In this study, we analysed the longitudinal distribution of macronutrients (total N and available P and K) and the mechanical composition of the sediments of Jegricka watercourse (a part of the multi-functional Danube-Tisa-Danube canal network) known for its exposure to anthropogenic loads. The results showed that the nutrient pollution index was mostly above 1.0 (in 76%, 86% and 93% of the analysed samples for K, N and P, respectively), and the mean values for N, P and K were 2.69, 1.92 and 1.24, respectively. The average content of all nutrients and the sand fraction were significantly higher, whereas the clay fraction was considerably lower, in the sediment samples than in the adjacent arable Chernozem soil used as a benchmark. The differences in the nutrient contents and mechanical properties in the sediments were measured longitudinally (at upstream vs. downstream stations) and assessed using correlation, cluster analysis, and principal component analysis. The results suggest that the nutrient sources in the sediments as well as their transport and loading mechanisms along Jegricka watercourse are diverse and complex, likely driven by a combination of untreated industrial/urban wastewater discharges, erosion and surface runoff from the surrounding agricultural land. As a majority of the analysed watercourse banks belong to areas of special ecological value, the obtained results may be useful: i) indicators for designing and implementation of sustainable land/water policies and measures for the protection and rehabilitation of these valuable ecosystems, ii) inputs for testing/calibrating the sediment transport models and iii) the basis for sediment management.",
journal = "Science of the Total Environment",
title = "Longitudinal distribution of macronutrients in the sediments of Jegricka watercourse in Vojvodina, Serbia",
volume = "754",
doi = "10.1016/j.scitotenv.2020.142138",
url = "conv_1513"
}

Savić, R., Ondrasek, G., Zemunac, R., Bubalo Kovacić, M., Kranjcec, F., Nikolić-Jokanović, V.,& Bezdan, A.. (2021). Longitudinal distribution of macronutrients in the sediments of Jegricka watercourse in Vojvodina, Serbia. in Science of the Total Environment, 754.
https://doi.org/10.1016/j.scitotenv.2020.142138
conv_1513

Savić R, Ondrasek G, Zemunac R, Bubalo Kovacić M, Kranjcec F, Nikolić-Jokanović V, Bezdan A. Longitudinal distribution of macronutrients in the sediments of Jegricka watercourse in Vojvodina, Serbia. in Science of the Total Environment. 2021;754.
doi:10.1016/j.scitotenv.2020.142138
conv_1513 .

Savić, Radovan, Ondrasek, Gabrijel, Zemunac, Rados, Bubalo Kovacić, Marina, Kranjcec, Filip, Nikolić-Jokanović, Vesna, Bezdan, Atila, "Longitudinal distribution of macronutrients in the sediments of Jegricka watercourse in Vojvodina, Serbia" in Science of the Total Environment, 754 (2021),
https://doi.org/10.1016/j.scitotenv.2020.142138 .,
conv_1513 .

TY  - JOUR
AU  - Savić, Radovan
AU  - Bezdan, Atila
AU  - Josimov-Dunđerski, Jasmina
AU  - Letić, Ljubomir
AU  - Nikolić, Vesna
AU  - Ondrašek, Gabrijel
PY  - 2014
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/625
AB  - Na osnovu mesečnog monitoringa relevantnih indikatora kvaliteta površinskih voda, kod vodotoka Krivaja tokom analiziranog perioda 2006-2011. godine konstatovan je nezadovoljavajući kvalitet i učestala pojava najlošijih klasa ekološki statusa. Takvo stanje u znatnoj meri ograničava ili onemogućava upotrebljivost voda Krivaje u ma koje svrhe. Na osnovu podataka sa tri merne stanice, ustanovljena je longitudinalna distribucija analiziranih parametara i degradacija kvaliteta vode duž toka koja je prouzrokovana uticajem različitih zagađivača. Zaštita, revitalizacija i racionalno upravljanje vodama Krivaje, kao značajnog vodnog resursa po-dručja kroz koje protiče, učinili bi da se ovaj vodotok izbriše sa liste "crnih tačaka" kvaliteta površinskih voda. Prevazilaženjem uočenog problema, Krivaja bi se osim kao recipijent otpadnih voda mogla koristiti bez opasnosti od negativnih efekata i u druge svrhe, a njene vode i obale ponovo učiniti privlačnim i upotrebljivim, između ostalog, i za navod-njavanje okolnih obradivih površina plodne vojvođanske ravnice i proizvodnju zdravstveno bezbedne hrane.
AB  - Based on the monthly monitoring of the relevant indicators of surface water quality during the period of analysis, from year 2006 to 2011, an unsatisfactory ecological status and frequent occurrence of the worst quality class was noted in the Krivaja watercourse. This situation considerably limits or prevents the use of water from this river for any purpose. Also, based on the data from the three measuring stations, the longitudinal distribution of the analyzed parameters and degradation of water quality along the Krivaja watercourse was found. Protection, revitalization and rational management of Krivaja waters as an important water resource of the areas it flows through, would make this watercourse deleted from the surface water quality "black spots" list. As soon as the identified problems have been overcome, apart from being a wastewater recipient, the Krivaja can be used for other purposes without the risk of adverse effects. Furthermore, its waters and coastline may again be attractive and usable (for the irrigation of the surrounding farmland and safe food production).
T2  - Agroznanje
T1  - Degradacija kvaliteta vode vodotoka Krivaja
T1  - Water quality degradation of Krivaja watercourse
EP  - 172
IS  - 2
SP  - 159
VL  - 15
DO  - 10.7251/AGRSR1402159S
UR  - conv_792
ER  - 

@article{
author = "Savić, Radovan and Bezdan, Atila and Josimov-Dunđerski, Jasmina and Letić, Ljubomir and Nikolić, Vesna and Ondrašek, Gabrijel",
year = "2014",
abstract = "Na osnovu mesečnog monitoringa relevantnih indikatora kvaliteta površinskih voda, kod vodotoka Krivaja tokom analiziranog perioda 2006-2011. godine konstatovan je nezadovoljavajući kvalitet i učestala pojava najlošijih klasa ekološki statusa. Takvo stanje u znatnoj meri ograničava ili onemogućava upotrebljivost voda Krivaje u ma koje svrhe. Na osnovu podataka sa tri merne stanice, ustanovljena je longitudinalna distribucija analiziranih parametara i degradacija kvaliteta vode duž toka koja je prouzrokovana uticajem različitih zagađivača. Zaštita, revitalizacija i racionalno upravljanje vodama Krivaje, kao značajnog vodnog resursa po-dručja kroz koje protiče, učinili bi da se ovaj vodotok izbriše sa liste "crnih tačaka" kvaliteta površinskih voda. Prevazilaženjem uočenog problema, Krivaja bi se osim kao recipijent otpadnih voda mogla koristiti bez opasnosti od negativnih efekata i u druge svrhe, a njene vode i obale ponovo učiniti privlačnim i upotrebljivim, između ostalog, i za navod-njavanje okolnih obradivih površina plodne vojvođanske ravnice i proizvodnju zdravstveno bezbedne hrane., Based on the monthly monitoring of the relevant indicators of surface water quality during the period of analysis, from year 2006 to 2011, an unsatisfactory ecological status and frequent occurrence of the worst quality class was noted in the Krivaja watercourse. This situation considerably limits or prevents the use of water from this river for any purpose. Also, based on the data from the three measuring stations, the longitudinal distribution of the analyzed parameters and degradation of water quality along the Krivaja watercourse was found. Protection, revitalization and rational management of Krivaja waters as an important water resource of the areas it flows through, would make this watercourse deleted from the surface water quality "black spots" list. As soon as the identified problems have been overcome, apart from being a wastewater recipient, the Krivaja can be used for other purposes without the risk of adverse effects. Furthermore, its waters and coastline may again be attractive and usable (for the irrigation of the surrounding farmland and safe food production).",
journal = "Agroznanje",
title = "Degradacija kvaliteta vode vodotoka Krivaja, Water quality degradation of Krivaja watercourse",
pages = "172-159",
number = "2",
volume = "15",
doi = "10.7251/AGRSR1402159S",
url = "conv_792"
}

Savić, R., Bezdan, A., Josimov-Dunđerski, J., Letić, L., Nikolić, V.,& Ondrašek, G.. (2014). Degradacija kvaliteta vode vodotoka Krivaja. in Agroznanje, 15(2), 159-172.
https://doi.org/10.7251/AGRSR1402159S
conv_792

Savić R, Bezdan A, Josimov-Dunđerski J, Letić L, Nikolić V, Ondrašek G. Degradacija kvaliteta vode vodotoka Krivaja. in Agroznanje. 2014;15(2):159-172.
doi:10.7251/AGRSR1402159S
conv_792 .

Savić, Radovan, Bezdan, Atila, Josimov-Dunđerski, Jasmina, Letić, Ljubomir, Nikolić, Vesna, Ondrašek, Gabrijel, "Degradacija kvaliteta vode vodotoka Krivaja" in Agroznanje, 15, no. 2 (2014):159-172,
https://doi.org/10.7251/AGRSR1402159S .,
conv_792 .

TY  - JOUR
AU  - Savić, Radovan
AU  - Ondrasek, Gabrijel
AU  - Bezdan, Atila
AU  - Letić, Ljubomir
AU  - Nikolić, Vesna
PY  - 2013
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/523
AB  - The study analyses fluvial deposition (sedimentation) in groyne fields constructed on the meandering section of the Danube River from Novi Sad (Republic of Serbia) to the border of the Republic of Croatia, the Republic of Serbia and Hungary (1255 divided by 1433 km stations). By processing satellite images (Google Earth) of the studied area, groyne systems were detected at 25 locations and their characteristics and sedimentation by the river deposited materials were elaborated on more than 100 groyne fields. Results show that on the observed groyne fields and systems, the new areas, formed by fluvial deposition, are overspread on totally over 5,5 million m(2) (cca 3,13 million m(2) on the left and 2,38 million m(2) on the right riverside). Distribution of groyne fields more affected by fluvial sediments was substantially greater on the left (similar to 60 %) than on the right (similar to 40 %) Danube riverside. On predominant portion of the groyne systems (15/25) fluvial sedimentation occupied 40 divided by 80 % of the total groyne field area.
PB  - Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek
T2  - Tehnički vjesnik
T1  - Fluvial deposition in groyne fields of the middle course of the Danube river
EP  - 983
IS  - 6
SP  - 979
VL  - 20
UR  - conv_2168
ER  - 

@article{
author = "Savić, Radovan and Ondrasek, Gabrijel and Bezdan, Atila and Letić, Ljubomir and Nikolić, Vesna",
year = "2013",
abstract = "The study analyses fluvial deposition (sedimentation) in groyne fields constructed on the meandering section of the Danube River from Novi Sad (Republic of Serbia) to the border of the Republic of Croatia, the Republic of Serbia and Hungary (1255 divided by 1433 km stations). By processing satellite images (Google Earth) of the studied area, groyne systems were detected at 25 locations and their characteristics and sedimentation by the river deposited materials were elaborated on more than 100 groyne fields. Results show that on the observed groyne fields and systems, the new areas, formed by fluvial deposition, are overspread on totally over 5,5 million m(2) (cca 3,13 million m(2) on the left and 2,38 million m(2) on the right riverside). Distribution of groyne fields more affected by fluvial sediments was substantially greater on the left (similar to 60 %) than on the right (similar to 40 %) Danube riverside. On predominant portion of the groyne systems (15/25) fluvial sedimentation occupied 40 divided by 80 % of the total groyne field area.",
publisher = "Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek",
journal = "Tehnički vjesnik",
title = "Fluvial deposition in groyne fields of the middle course of the Danube river",
pages = "983-979",
number = "6",
volume = "20",
url = "conv_2168"
}

Savić, R., Ondrasek, G., Bezdan, A., Letić, L.,& Nikolić, V.. (2013). Fluvial deposition in groyne fields of the middle course of the Danube river. in Tehnički vjesnik
Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek., 20(6), 979-983.
conv_2168

Savić R, Ondrasek G, Bezdan A, Letić L, Nikolić V. Fluvial deposition in groyne fields of the middle course of the Danube river. in Tehnički vjesnik. 2013;20(6):979-983.
conv_2168 .

Savić, Radovan, Ondrasek, Gabrijel, Bezdan, Atila, Letić, Ljubomir, Nikolić, Vesna, "Fluvial deposition in groyne fields of the middle course of the Danube river" in Tehnički vjesnik, 20, no. 6 (2013):979-983,
conv_2168 .

TY  - JOUR
AU  - Savić, Radovan
AU  - Letić, Ljubomir
AU  - Ondrašek, Gabrijel
AU  - Bezdan, Atila
AU  - Nikolić, Vesna
PY  - 2011
UR  - https://omorika.sfb.bg.ac.rs/handle/123456789/359
AB  - Preko 75% pretežno ravničarskog područja Vojvodine pokriveno je obradivim poljoprivrednim zemljištem. Znatnim delom godine ove površine su bez vegetacionog pokrivača te su izložene različitim vidovima vodne i eolske erozije. Erozioni procesi dovode do odnošenja najfinijeg površinskog sloja zemljišta a sa njim i unetih agrohemijskih sredstava i opadanja plodnosti. Ovo se pre svega odnosi na sadržaj fosfora čija su jedinjenja snažno vezana za čvrstu fazu zemljišta. Jedan deo čestica pokrenutog nanosa dospeva i do relativno guste mreže melioracionih kanala i tu se privremeno ili trajno taloži. Na osnovu analize preko 80 uzoraka, razmatran je sadržaja fosfora u kanalskim sedimentima. Ustanovljene koncentracije ovog elementa u sedimentima višestruko su iznad njihovog sadržaja u okolnom obradivom zemljištu. Povećanje koncentracije fosfora u sedimentima može se uočiti i duž pojedinih analiziranih kanalskih deonica. Naime, značajno su veće koncentarcije ovog nutrijenta u uzorcima zahvaćenim na nizvodnim profîlima u odnosu na uzvodne profile, u proseku za oko 50 - 60%, ali su izdvojene kanalske deonice gde se ove vrednosti razlikuju i do 5 puta. Dobijeni rezultati jasno ukazuju na procese povećanja koncentracije i kumulacije fosfora u sedimentima kako u odnosu na zemljište u okruženju, tako i duž pojedinih kanalskih deonica.
AB  - Over 75% of mostly lowland area in Vojvodina is distributed on arable agricultural land. During the substantial period over the year that areas are without vegetation and therefore very susceptible to wind and/or water erosion processes. Erosion may induce significant losses of the finest and the most valuable topsoil constitutes with different adsorbed agrochemicals such as nutrient phosphorous (P) forms, which are usually strong bind to soil inorganic matrix (e.g. clay particles etc). Certain portion of erosion material reaches to relatively dense network of ameliorative drainage channels to be permanently/temporarily deposited. Based on analyses of over 80 drainage channel samples P content was discussed in this study. Detected P concentration in analyzed sediments exceeded its concentration in surrounding arable land by multi-fold. Excessive P levels are detected along a particular channel sections also. Markedly higher levels of this nutrient in downstream section sediments exceeded in average by around 50-60% (i.e. maximally up to 5-fold) P levels in upstream locations-cross sections. Obtained results clearly indicate on processes of P overloading in channel sediment materials in comparison to surrounding arable soils as well along to certain network sections.
T2  - Agroznanje
T1  - Sadržaj fosfora u kanalskim sedimentima
T1  - Phosphorus content in drainage channel sediments
EP  - 324
IS  - 3
SP  - 317
VL  - 12
UR  - conv_790
ER  - 

@article{
author = "Savić, Radovan and Letić, Ljubomir and Ondrašek, Gabrijel and Bezdan, Atila and Nikolić, Vesna",
year = "2011",
abstract = "Preko 75% pretežno ravničarskog područja Vojvodine pokriveno je obradivim poljoprivrednim zemljištem. Znatnim delom godine ove površine su bez vegetacionog pokrivača te su izložene različitim vidovima vodne i eolske erozije. Erozioni procesi dovode do odnošenja najfinijeg površinskog sloja zemljišta a sa njim i unetih agrohemijskih sredstava i opadanja plodnosti. Ovo se pre svega odnosi na sadržaj fosfora čija su jedinjenja snažno vezana za čvrstu fazu zemljišta. Jedan deo čestica pokrenutog nanosa dospeva i do relativno guste mreže melioracionih kanala i tu se privremeno ili trajno taloži. Na osnovu analize preko 80 uzoraka, razmatran je sadržaja fosfora u kanalskim sedimentima. Ustanovljene koncentracije ovog elementa u sedimentima višestruko su iznad njihovog sadržaja u okolnom obradivom zemljištu. Povećanje koncentracije fosfora u sedimentima može se uočiti i duž pojedinih analiziranih kanalskih deonica. Naime, značajno su veće koncentarcije ovog nutrijenta u uzorcima zahvaćenim na nizvodnim profîlima u odnosu na uzvodne profile, u proseku za oko 50 - 60%, ali su izdvojene kanalske deonice gde se ove vrednosti razlikuju i do 5 puta. Dobijeni rezultati jasno ukazuju na procese povećanja koncentracije i kumulacije fosfora u sedimentima kako u odnosu na zemljište u okruženju, tako i duž pojedinih kanalskih deonica., Over 75% of mostly lowland area in Vojvodina is distributed on arable agricultural land. During the substantial period over the year that areas are without vegetation and therefore very susceptible to wind and/or water erosion processes. Erosion may induce significant losses of the finest and the most valuable topsoil constitutes with different adsorbed agrochemicals such as nutrient phosphorous (P) forms, which are usually strong bind to soil inorganic matrix (e.g. clay particles etc). Certain portion of erosion material reaches to relatively dense network of ameliorative drainage channels to be permanently/temporarily deposited. Based on analyses of over 80 drainage channel samples P content was discussed in this study. Detected P concentration in analyzed sediments exceeded its concentration in surrounding arable land by multi-fold. Excessive P levels are detected along a particular channel sections also. Markedly higher levels of this nutrient in downstream section sediments exceeded in average by around 50-60% (i.e. maximally up to 5-fold) P levels in upstream locations-cross sections. Obtained results clearly indicate on processes of P overloading in channel sediment materials in comparison to surrounding arable soils as well along to certain network sections.",
journal = "Agroznanje",
title = "Sadržaj fosfora u kanalskim sedimentima, Phosphorus content in drainage channel sediments",
pages = "324-317",
number = "3",
volume = "12",
url = "conv_790"
}

Savić, R., Letić, L., Ondrašek, G., Bezdan, A.,& Nikolić, V.. (2011). Sadržaj fosfora u kanalskim sedimentima. in Agroznanje, 12(3), 317-324.
conv_790

Savić R, Letić L, Ondrašek G, Bezdan A, Nikolić V. Sadržaj fosfora u kanalskim sedimentima. in Agroznanje. 2011;12(3):317-324.
conv_790 .

Savić, Radovan, Letić, Ljubomir, Ondrašek, Gabrijel, Bezdan, Atila, Nikolić, Vesna, "Sadržaj fosfora u kanalskim sedimentima" in Agroznanje, 12, no. 3 (2011):317-324,
conv_790 .